| 摘要 |
A free piston Stirling machine comprises a displacer 1 and a power piston 2 which reciprocate in a cylinder 4, 5. A friction element 14 is positioned on the displacer, power piston or cylinder to come into contact with an adjacent component when displacement of the displacer or power piston exceeds a predetermined value to exert a retarding force on it. As shown in figure 2b, the friction element may be provided or energised by a material which exhibits anisotropic thermal expansion, to protect the engine during a sudden change in coolant temperature. |
